Abstract
The effect of superhigh Q was revealed theoretically in investigation of coupling of electromagnetic oscillations in open waveguide resonators in the vicinity of singular points (so- called Morse critical points MCP) of the dispersion equation. The effect is connected with anomalous behavior of the diffraction Q factor, which tends to infinity near the MCP. An experimental study of the effect of superhigh Q oscillations in an open resonator (OR) of a diffraction radiation generator (DRG) has been considered in the paper. It has been found that if an interaction between oscillations and competitive dispersion modes on diffraction grating of the generator leads to realization of the phenomenon of compensation of dispersions. As the result, dispersion curves have such sections where the frequency of the generator does not depend on small changes of an external control parameter (an accelerating voltate or a distance between the mirrors of OR). At these sections the frequency of DRG remain constant and this fact caused the effect of superhigh Q.
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